Avoid to create deleted instances during sync

If the powervc instance is removed from driver's call or powervc side,
there will be a timing issue between the sync call and driver call, the
sync call still list the powervc instance before it insert the local
record. Add a global list to keep the removed powervc instance ids, and
avoid to create such local instance if the powervc instance has already
been deleted.

Closes-Bug: #13918752
Change-Id: If1e7993f4ae1517577c909fb71134ba50c88083f